DIAGNOSE NUTRICIONAL DA CANA-DE-AÇÚCAR (Saccharum spp.) FERTILIZADA COM ORGANOMINERAIS A BASE DE LODO DE ESGOTO E BIOESTIMULANTE

Abstract

In Brazil sugar cane (Saccharum spp.) continues to expand, with emphasis on the Central West region should maintain area harvested in relation to the past harvest, with expectations of improvements in productivity. Organomineral fertilizers and a mixture of organic compounds with supplementation of mineral sources, these generate great expectations in the efficiency, economy and sustainability of fertilization. The sewage sludge is a solid residue resulting from processes of biological treatment of sewage, it’s a promising alternative for the production of organomineral fertilizers for the fertilization of large crops such as sugar cane. Biostimulants are natural or synthetic substances that can be applied directly to plants to alter their vital and structural processes to increase yield and quality of crops of economic interest. The objective of this work was to study the nutritional status of sugarcane fertilized with organomineral fertilizer based on sewage sludge associated or not with biostimulants. The experimental design was conducted in randomized blocks, with a 5x2 + 1 factorial scheme, five treatments with and without a biostimulant, plus an additional one (mineral fertilization) with four replications. The treatment combinations were based on the recommendation of planting and cover fertilization, based on the soil analysis of the experimental area, consisting of: 100% with mineral source; 0; 60; 80; 100 and 120% (with and without biostimulant) from the organomineral source to sewage sludge base. The analyzed variables were the macronutrient contents (N, P, K, Ca, Mg and S) and micronutrients (B, Cu, Mn; Zn) at 150 DAP and 270 DAP in sugarcane. It was observed that the organomineral and mineral fertilizer are the same. The biostimulant associated with fertilization does not influence the nutritional status of the plant at 150 DAP. The biostimulant associated with sewage sludge fertilization increased the B content in sugarcane at 270 DAP.